Mower starter

ABSTRACT

A power operated lawn mower with an internal combustion engine having a pull cord starter mechanism and a foot operated attachment for pulling the starter cord. The foot operated starter pull cord attachment mounts on the rear of a cutting blade housing and has a vertical support and a V-shaped lever pivotal on the vertical support. One arm of the V-shaped lever connects to the starter pull cord and the other arm has a foot pedal for applying an accelerating force to the cord. The vertical support raises the height of the pivotal lever to a position where the movement of the lever arms provides a maximum pulling force in a short distance.

BACKGROUND OF THE INVENTION

The invention is directed to a foot operated starter for power lawnmowers with pull cord starter. There are several U.S. patents directedto foot operated starters; the following list of patents includes allthe patents which the inventor is aware of on foot operated attachmentsfor pulling a starter pull cord:

U.S. Pat. No. 2,850,003 Konle

U.S. Pat. No. 3,018,768 Thompson

U.S. Pat. No. 3,381,677 Hunter

U.S. Pat. No. 4,397,274 Tarnedde

A review of the listed patents will show that while parts of the footoperated starter attachments are similar, they do not show themechanical parts or mechanical advantage of the present invention. Thepatent issued to Konle, U.S. Pat. No. 2,850,003, provides a footoperated starter device which is Y-shaped and pivoted at its lowestpoint on the cutter blade housing. The height of the Y-shaped design andits low pivot point of the foot operated starter device makes a verylarge arc when pivoted. The direction of movement is first toward theoperator down and back toward the mower. Therefore, the first part ofthe movement provides little, if any, acceleration to the starter pullcord. Further, the first movement can actually pull the lawn mowertoward the operator unless an opposite force is applied. The possiblemovement can cause a hazard to the operator that can be avoided by thepresent invention.

Thompson, U.S. Pat. No. 3,018,768, discloses a foot operated starterdevice having a shallow V-shaped lever mounted on a short verticalsupport on a cutter blade housing. Due to the shallowness of theV-shaped lever, the length of the travel of the pivoted lever isrelatively small. To overcome the short pivotal movement, a pulley ismounted on one end of the lever arm and the free end of the starter pullrope is tethered to the cutter blade housing, thereby increasing thelength of travel of the cord, twice the length of travel of the V-shapedlever.

In Hunter, U.S. Pat. No. 3,381,677, a foot operated starter device ismounted by a bracket to the engine cover or shroud. A pivoted, U-shapedlever is pivoted to the bracket with a starter pull cord connector onthe U-shaped lever. When pressure is applied to a foot pedal, the leverpivots down pulling the pull cord over a pulley on the bracket to rotatethe starter. The location of the U-shaped lever, in front of the mowerhandle, makes it awkward to push down on the pedal without interferencefrom the handle. Further, the only support for the starter device is thespecial design of the engine cover. Another engine cover without therearwardly projection could not support the bracket adequately, andwould therefore, create stresses on the cover.

The foot operated starter device in Tarnedde, U.S. Pat. No. 4,397,274,consists of a V-shaped lever comprised of a pedal arm and a plurality ofleaf springs forming a pull cord arm. The leaf springs give addedimpulse or acceleration to the starter. The V-shaped lever is pivotallymounted on the cutter blade housing. Another embodiment shows a V-shapedlever with a pulley arrangement for doubling the length of travel of thepull cord, which increases the pulling force and acceleration of thepull cord.

Each of the above patents represents a solution for foot operatedstarters on lawn mowers. All of the starters are pivotal and intended toincrease the acceleration of the pull cord and starter. But, in order toachieve the desired results, the cost of manufacturing is quite high.For example, the Konle starter device is made of tubing and has aplurality of bends; the bracket in Hunter requires special equipment toform the bends, and Tarnedde uses expensive leaf springs. In addition,Thompson and Hunter require pulleys and adaptions to function. Thepresent invention is inexpensive to manufacture and is adaptable to alltypes of lawnmowers with pull cord starters.

The foot operated starter of the present invention provides more thansufficient pull on the starter cord to accelerate the starter mechanism.And the foot operated starter is operated without the hazard of pullingthe mower toward the operator.

It is therefore the object of the foot operated starter device toprovide an inexpensive device that is adaptable to all types of mowers,and at the same time will accelerate the starter mechanism without anyhazard during the foot operation. These and other objects will beapparent from the drawing, written description and claims.

DESCRIPTION OF THE DRAWINGS

FIG. 1 is an isometric view of a foot operated starter device of theinvention.

FIG. 2 is another isometric view of the foot operated starter device ofthe invention showing the device disassembled.

DESCRIPTION OF THE INVENTION

Referring to the drawings, there is shown a gasoline powered lawn mower10 with an internal combustion engine 12 and a handle 14. The lawn mower10 has a cutter blade housing 16 on which the engine 12 and handle 14are mounted. The housing 16 has a grass exit shoot 18 and wheels 20.

The internal combustion engine 12 has an output shaft connected to acutter blade (not shown), a gasoline tank 22 and a starter mechanism 24.To start the engine 12 the counter-weighted starter mechanism 24 isrotated at high speed at such a rate to cause initial combustion of thefuel. The starter mechanism is rotated by a pull cord 26 either with ahandle 28 connected to a foot operated starter device 30. Accelerationof the starter mechanism 24 is only achieved by a long hard pull on thepull cord 26. This accelerated pull is accomplished with the footoperated starter device 30 that can be adapted to most all types of pullstarter power lawn mowers.

Foot operated starter device 30 is mounted on the rear skirt 17 ofcutter blade housing 16 by a mounting plate 32 (FIG. 2) using bolts andlock washers. A vertical support 34 is bolted or welded to the mountingplate 32. The vertical support 34 is twisted at 36 so that the upper end38 is at right angle to the lower end 40. Pivot holes 42 and 44 areprovided in the upper end 38, these holes allow vertical adjustment of aV-shaped lever 46.

The V-shaped lever 46 is pivotally mounted on vertical support 34 by abolt 48 passed through a hole 40 in the elbow 52 of the lever 46. TheV-shaped lever 46 has a pair of arms 54 and 56, which are weldedtogether at a 90 degree angle. Arm 54 is twisted at 58 to a 90 degreeangle and has a keyhole type opening 60 which is an open slot 62 forreceiving and holding handle 28 of the starter pull cord, as in FIG. 1.The other arm 56 has a foot pedal 64 on its free end, which when forceddownwardly pivots V-shaped lever 46 and pulling pull cord 26 at anaccelerated speed.

An important feature of the foot operated starter device 30 is therelationship of the V-shaped lever 46 to the pull cord 26. The V-shapedlever 46 pivots in a manner to pull the pull cord 26 slightly upward andin the direction of the starter device 30 without any wasted motion. Themovement has to be accomplished at an accelerated rate, therefore, along hard pull on the cord 26 directly away from the starter mechanismis necessary. There should be no upward or downward motion. To insure amaximum pull on the cord 26, the vertical support is mounted on thecutter blade housing 16 with the pivot holes 44 or 42 positioned wherethe V-shaped lever 46 will pull the pull cord 26 slightly upward andthen will be aligned with the pull cord 26 to make sure there is nodownward pull which will reduce the accelerated pull near the end ofpivoted movement of the V-shaped lever 46.

To use the mounted foot operated starter device 30, foot pressure isapplied to pedal 64, which pivot V-shaped lever 46 and pulling on pullrope 26 to rotate starter mechanism 24 at an accelerated rate. Arms 54and 56 move approximately 90 degrees which is enough to give a long hardpull on cord 26.

It should be understood that while only one embodiment of the inventionhas been described, those skilled in the art may realize otherembodiments, therefore, one should consider the invention from thedrawing, claims and description for a full understanding.

I claim:
 1. A foot operated starter device for operating a pull cord starter of an internal combustion engine of a power lawn mower which has a cutter blade housing that supports the engine comprising:a) a vertical support on the cutter blade housing for supporting a foot operated starter device; b) a V-shaped lever pivoted on the vertical support where the vertical support and V-shaped lever are at a height to pull the pull cord slightly upward and horizontally from the pull cord starter, there being no downward pull of the pull cord payed from the engine starter; and c) said V-shaped lever having a pair of arms at 90° from one another, one of said arms having a connector means for receiving and holding the pull cord as the cord is pulled, and the other of said arms having a pedal means for pivoting the V-shaped lever; d) said vertical support has at least two pivot support means for final height adjustment of the foot operated starter.
 2. A foot operated starter device as in claim 1 wherein a mounting plate is mounted on a rear skirt of the cutter blade housing for supporting the vertical support means. 